[UNIX] sh-httpd Wildcard Character Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 10/28/03

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Date: 28 Oct 2003 11:01:00 +0200

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      sh-httpd Wildcard Character Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://lrp.steinkuehler.net/Packages/weblet.htm> sh-httpd is "a shell
    script-based web server that supports GET and HEAD methods and a CGI 1.1
    interface". A vulnerability in the product allows remote attackers to
    execute and read any file they desire by requesting filenames with
    wildcards.

    DETAILS

    Vulnerable systems:
     * sh-httpd version 0.4
     * sh-httpd version 0.3

    By requesting a filename from a remote host and inserting a wildcard ('*')
    with the filename, a remote attacker can read any file from the remote
    server or execute any CGI the attacker desires.

    Examples:
    GET *
    GET ../../../sh-httpd/p*
    GET /../../etc/s*
    GET ../../root/.b*

    Patch:
     === sh-httpd.patch ===

    --- sh-httpd-0.4/sh-httpd Mon Oct 9 11:28:05 2000
    +++ sh-httpd.patch Sat Jul 19 08:51:44 2003
    @@ -31,7 +31,7 @@

     bname() {
            local IFS='/'
    - set -- $1
    + set -- "$1"
            eval rc="\$$#"
            [ "$rc" = "" ] && eval rc="\$$(($# - 1))"
            echo "$rc"
    @@ -262,7 +262,7 @@

            # Split URI into base and query string at ?
            IFS='?'
    - set -- $URI
    + set -- "$URI"
            QUERY_STRING="$2"
            URL="$1"
            IFS=$OIFS
    @@ -292,7 +292,7 @@
            fi

            DIR="`dname $URL`"
    - FILE="`bname $URL`"
    + FILE="`bname "$URL"`"

            # Check for existance of directory
            if [ ! -d "$DOCROOT/$DIR" ]; then
     === eof ===

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:xploit_@_hackermail.com>
    dong-h0un U.

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